Ball point pen



FIG. 1 is a perspective view of a cap for a ball point pen showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is an explanatory front view showing the state of use; and,

FIG. 8 is an explanatory bottom view showing the state of use. 

The ornamental design for a ball point pen, as shown and described. 